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Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

Author

Listed:
  • Joud Hwalla

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Mahra Al-Mazrouei

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Khalood Al-Karbi

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Afraa Al-Hebsi

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Mariam Al-Ameri

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Fatima Al-Hadrami

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

  • Hilal El-Hassan

    (Department of Civil and Environmental Engineering, College of Engineering, Al Ain Campus, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates)

Abstract

This study investigates the effect of accelerated carbonation curing on the carbon sequestration potential, performance, and microstructure of alkali-activated slag mixes representing concrete masonry blocks (CMBs). The carbonation curing process parameters varied, including initial curing duration, carbonation curing duration, and carbonation pressure. Research findings showed that a maximum CO 2 uptake of 12.8%, by binder mass, was attained upon exposing concrete to 4 h initial curing and 20 h carbonation curing at a pressure of 5 bars. The compressive strength and water absorption capacity improved with longer initial and carbonation curing durations and higher pressure. Upon subjecting to salt attack, the mass and strength of 28-day concrete samples increased, owing to the formation of Friedel’s salt and Halite. All mixes could be used as non-load-bearing CMB, with a 1-day strength greater than 4.1 MPa. Based on the global warming potential index, the carbon footprint of carbonation-cured, alkali-activated slag concrete masonry units was up to 46% lower than non-carbonation-cured counterparts. Research findings offer valuable information on the production of carbonation-cured, cement-free concrete masonry blocks to replenish natural resources, recycle industrial waste, and mitigate CO 2 emissions.

Suggested Citation

  • Joud Hwalla & Mahra Al-Mazrouei & Khalood Al-Karbi & Afraa Al-Hebsi & Mariam Al-Ameri & Fatima Al-Hadrami & Hilal El-Hassan, 2023. "Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing," Sustainability, MDPI, vol. 15(19), pages 1-20, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:19:p:14291-:d:1249175
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    References listed on IDEAS

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    1. Mohammed H. Alzard & Hilal El-Hassan & Tamer El-Maaddawy, 2021. "Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates," Sustainability, MDPI, vol. 13(18), pages 1-26, September.
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